Piano action or movement



A.PURRER PIANO ACTION OR MOVEMENT Filed Nov. 11, 1924 Dec. 1,1925 v 1,563,526

Bk, Wmk

0 HTTOKNEY.

Patented Dec. 1, 1925.

UNITED STTES ANTON PI TBRER, OF KLOSTERNEUBURG, AUSTRIA.

PIANO ACTION OR MOVEMENT.

Application filed November 11, 1924. Serial No. 749,130.

To all whom it may concern:

Be it known that I, .L1N'JJON Pi'mnnn, a subject of the Republic of Austria, residing at Klosterneuburg, Austria, have invented new and useful Improvements in Piano Actions or lilovements, of which the f r llowing is a specification.

This invention relates to improvements in piano-actions or movements with one-armed key-levers, which are jointed at one end.

According to the present invention hooked guide-members are arranged between the individual key-levers, which not only prevent a lateral adjustment of the keys, but also serve as pivots for the hammer-shafts ointed to the key-levers.

Two modes of carrying out the present invention are shown by way of example on the accompanying drawing in which,

Fig. 1 is a part-sectional side-view of an action for pianos with horizontally disposed strings.

Fig. 2 is a part-sectional side-view of an action for pianos with upright strings, and

Fig. 3 is a section taken on line Al3 of Fig 1.

In the illustrated embodiments the articu lated connection between the key 1 and the hammer-seat 3, as well as between the hammer-joint and the hammer-shaft 6 is established by means of parchment-strips 2 and 5 respectively in order to reduce the cost of manufacture.

However, if desired these articulated connections may be carried out by means of wooden or metal joints or links of the known shape. However, the key 1 may be provided with a separate link and may be screwed to the hammer-seat in order to enable the removal of each individual key.

Hooked guide-members 11 are screwed into the frame of the key-board between the individual key-love s, so that the keys cannot st ike against each other when playing on the piano.

According to the present invention the key 1 is in the shape of a quite freely floating trap-lever to which the flat hammershaft 6, formed with the hammer-head in one piece, is screwed by means of its hammer-joint 4-, so that the cloth covered end 7 of the hammer-shaft rests on the hooked guide-member 11 and the hammer-head 8' upon the hammer-cushion 13.

The position of the keys may be re ulated in height by screwing in or out the hooked guide-members, while the play of the pianoaction or movement can be regulated according to requirement by means of bending forwardly or backwardly the hooked guidemembers and the fall or drop of the keys and the degree of lifting the hammer can be adjusted by meanslof the stop-ledge 29 and 30' respectively. The vibration of the hammer-head 8, after striking the key, is prevented by the catch-lever 27 or 25, which screwed into the hammer-shaft G, cooporating with the cushion 28 or 26 secured to the corresponding hammer-joint 4.

Extensions screwed to the rear end of the key 1 and a lifting projection 52% serve for raising the damper 18 or 23 respectively.

According to the present invention the striking of the hammer is effected in a most simple manner without the provision of 1' push-tongue or push-lever hitherto necessary in all high-class actions or movements. On depressing the key 1, the rear end of which is jointed to the hammer-seat 3, the hammer-joint 4; is simultaneously pulled down and therefore the hammer-shaft 6, resting with its cloth-covered end 7 on the hooked guide-member 11, and thus also the head 8 are flung against the string 32 and during the backward movement are immedi ately caught by the catch-levers 27 and 25 respectively, thus preventing any vibration of the same.

I claim:

1. A piano action comprising one-armed key-levers, guide members between the levers to prevent lateral motion thereof, and hammer shafts articulated to the key-levers and designed to encounter the guide. members as fulcrums when the levers are depressed.

2. A piano action as claimed in claim 1, said guide members having hooked portions overlying the key-levers and designed to be encountered by said haimner-shafts.

3. A piano action comprising a key-lever fulcrumed at its rear end, a hammer shaft flexibly jointed thereto, and a guide member adjacent the key-lever to prevent lateral motion of the latter and having a portion overlying the lever designed to be encountered as a fulcrum by the hammer shaft when the key-lever is depressed.

In testimony whereof I have signed my name to this specification. H

' ANTON E URRER.

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